[Catalog] Make SearchView in Catalog full-screen

This change removes the fitsSystemWindows attribute in the main search demo fragment, which allows the search view to span full-screen, like other demos.

PiperOrigin-RevId: 859163506

Author: Material Design Team

catalog/java/io/material/catalog/search/res/layout/cat_search_fragment.xml

@@ -18,8 +18,7 @@
     xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     android:layout_width="match_parent"
-    android:layout_height="match_parent"
-  android:fitsSystemWindows="true">
+    android:layout_height="match_parent">
 
   <androidx.core.widget.NestedScrollView
       android:id="@+id/nested_scroll_view"